| 摘要 |
A raster controller having a microprocessor for storing a preset video signal of red, green and blue components, a clock generator for generating a clock signal of a constant time period, a synchronization and blocking signal generator for receiving a clock signal output from the clock generator and a video signal output from a microprocessor so as to generate a synchronization signal and a blanking signal, a multiplexer for inputting a synchronizing signal generated from the synchronization and blanking signal generator and a horizontal synchronizing signal supplied from a video signal generator in a computer system, responsive to a raster control signal, and for selectively generating a synchronization signal, an AND gate for inputting a blanking signal output from the synchronization and blanking signal generator to perform a logic product operation and a switch, responsive to the raster control signal, for inputting a signal output from the AND gate so as to switch on/off a video signal output. As a result, without a signal input from external video signal generator in a computer system, the raster controller enables various tests of performance of a monitor incorporating the instant invention in the manufacturing process.
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